Items with "Costello, Matthew J." as Credited Author
Call of Cthulhu
Alone Against the DarkCrossroads Adventures
3. Robert Silverberg's Majipoor: Revolt on Majipoor14. Robert Heinlein's Glory Road: Fate's Trick
Cthulhu
Allein gegen die DunkelheitDC Heroes
Hex: Escort to HellWheel of Destruction
Fantasy Gamer
The Thing in the DarknessGAMES
Escape from Horror IslandThe Paradox Labyrinth